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Core revenue excludes revenue attributable to the products from two small legacy acquisitions, both of which occurred prior to 2008, which we do not consider to be a core part of our strategic focus going forward.

Number of core customers includes all customers who subscribe to at least one of our solutions other than the non-core, legacy products.

Average revenue per core customer is total core revenue divided by the average monthly number of core customers during the period.

Subscription dollar retention rate is calculated for a particular period by establishing the cohort of core customers that had active contracts as of the end of the prior period. We then calculate our subscription dollar retention rate by taking the amount of fixed subscription revenue we recognized for the cohort in the period for which we are reporting the rate and dividing it by the fixed subscription revenue we recognized for the same cohort in the prior period. For this purpose, we do not include any non-core revenue, any variable subscription fees paid by our customers or any implementation fees.